Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Foamed celluloid mortar propellant increment containers

a technology of propellant container and foam celluloid, which is applied in the direction of looms, explosives, weaving, etc., can solve the problems of affecting the velocity and range of foam mics affecting the combustible case of typical foam celluloid by as much as 5%, and achieving the same level of water resistance, easy moldability, and easy manufacturing

Active Publication Date: 2013-12-31
UNITED STATES OF AMERICA THE AS REPRESENTED BY THE SEC OF THE ARMY
View PDF5 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention offers a new material for easy molding and low residue, which is more durable and resistant to wetness compared to current felt MICs. This material is called foamed celluloid, which has high energy levels and is composed of nitrocellulose, camphor, and other additives. The foamed celluloid MICs have superior water resistance, combustion characteristics, impact resistance, mechanical strength, and resistance to old weather embrittlement. This material is more cost-effective than current felt MICs.

Problems solved by technology

Unfortunately, this manufacturing process involves multiple steps including matting, condensing and pressing fibers, which are labor intensive and relatively costly.
Further, it is known that moisture can negatively impact the velocity and range of felt MICs by as much as 5%.
It is known that typical celluloid combustible cases experience residue issues, as well as, having mechanical strength and embrittlement issues, especially at low temperatures.
Of these issues the most troubling is residue, as combustible increment containers used in mortar and artillery propulsion systems must burn cleanly, free of after-combustion residue, to avoid creating an obstruction within the launch tube of the projectile system.
Any obstruction within the launch tube can lead to misfires or hang fires which could result in the immediate detonation of the projectile, with significant potential for injury or death of the crew.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preferred Combined CBA / PBA Process for Manufacture of Foamed Celluloid

[0016]1. In a mixer that can be heated, such as a Measuring Mixer manufactured by Brabender GmbH & Co., Duisburg, Germany, combine about 50 weight % nitrocellulose (NC), having a nitrogen content of from 10.5 wt. % to 13.5 wt. %, preferably lower than 12.6% and most preferably about 11%; with about 15 wt. % camphor; with about 3% of a chemical blowing agent (CBA) that will generate CO2 when decomposed, potential CBAs include sodium bicarbonate, azodicarbonamide (commonly referred to as AZ), benzene sulfonylhydrazide, and 5-phenyl tetrazole, and a commercial CBA which is particularly preferred is SAFOAM FPN3-40, manufactured and distributed by Reedy International Corp., Keyport, N.J.; and about 30% by weight of a solvent, such as a 50% / 50% mixture of ethanol and methanol;

2. Run the mixer at a moderate agitation of about 30 rpm, for about 25 to about 35 minutes, at about 120 to about 125° F., until the mixture there...

example 2

Preferred PBA Process for Manufacture of Foamed Celluloid

1. A non-foamed celluloid sheet is prepared according to steps 1 through 5, above, except that no CBA ingredient is added;

2. The dried sheet is placed in a convention autoclave, capable of temperatures of at least 400° F. and pressures of up to 15,000 psi;

[0017]3. The autoclave is pressurized to from about 2,000 psi to about 12,000 psi, preferably from about 6,000 to about 8,000 psi, by the injection of a PBA, such as nitrogen, carbon dioxide, or argon, preferably nitrogen or carbon dioxide, and most preferably carbon dioxide, and set at a temperature between about 250° F. and about 350° F., preferably between about 250° F. and about 300° F., for a period of from about 10 minutes to about 24 hours;

4. The desired foamed celluloid sheet is removed from the autoclave.

[0018]The burn rate of the foamed celluloid can be enhanced by mixing an energetic additive to the initial nitrocellulose mixture of step 1 of Example 1; a preferred...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
temperatureaaaaaaaaaa
thicknessaaaaaaaaaa
temperatureaaaaaaaaaa
Login to View More

Abstract

An economical, low residue, mortar increment propellant container manufactured of foamed celluloid, which is composed of 50 to 84% nitrocellulose, having a nitrogen content of from about 10.5 to about 13.5%, and about 15 to about 50% camphor. The burn rate of the foamed celluloid can be enhanced by the addition of energetic additives, such as energetic plasticizers.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation-in-part of currently co-pending U.S. patent application Ser. No. 12 / 125,474, filed May 22, 2008, which application claimed the benefit under 35 USC §119(e) of provisional application 60 / 939,660, filed May 23, 2007, which copending application and which provisional application are both hereby incorporated by reference. Further, this application also claims the benefit under 35 USC §119(e) of U.S. provisional patent application 61 / 061,249, filed on Jun. 13, 2008, which provisional application is also hereby incorporated by reference.FEDERAL RESEARCH STATEMENT[0002]The inventions described herein may be manufactured, used, and / or licensed by the U.S. Government for U.S. Government purposes.FIELD OF THE INVENTION[0003]The present invention relates to mortar round propellant increment containers and more particularly to such containers manufactured of low residue foamed celluloid.BACKGROUND OF THE INVENTION[0...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): C06B25/20D03D43/00C06B45/10C06B25/18D03D23/00C06B45/00
CPCF42B30/12C06B25/18C06B45/10C06B23/002F42B5/38C06B45/00C06B25/20D03D23/00D03D43/00
Inventor YOUNG, MING-WANGOGOS, COSTAS G.FARIDI, NILOUFARZHU, LINJIEBONNETT, PETERSHIMM, HOWARDCARAVACA, ELBERTPALK, JR., JOSEPH
Owner UNITED STATES OF AMERICA THE AS REPRESENTED BY THE SEC OF THE ARMY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com